I don't know if this is any help, i use Jeppeson charts for my reference when flying into or out of a airport. They give you ALL the information you need, these might help you for parking. Here is one for reference to see if it is what you need. This is EGKK (Gatwick) see page 29 (of 43) for a comprehensive map of parking positions and taxiways. http://www.ukvirtual.co.uk/dl/charts/egkk.pdf All you need to do is put in google search jeppeson charts for "****" ( "****" = the ICAO code of the airport that you want the chart for) Hope this may help in your question? Let me know if it does please, If it does "mark" your question as solved!

OR bases on official Flightgear data. The files are outdated, but it might be, that the needed information is still not included, I try to find more recent ones and ship it with the next update. Maybe this change comes after the next update.

DISREGARD my link above as it no longer works But here is another that give this info' : https://www.rocketroute.com/airports (Click on the area of the world, then the Country, then the airport) You can find all the data here you need Current METAR, Plates (Most up to date I have found) Etc:

As I said I have copied the files to use the same in the new version too, but I have not found a more recent version of the apt.dat files to download.. I would appreciate if someone would give me a hint...